Chemical-feed device.



R. HILSGHER.

CHEMICAL FEED DEVICE. APPLIOATION FILED SEPT. 11I 1912.

,jlqv Patented June 10, 1913.

2 SHEETS-SHEET 1.

m'-m 35.3... E..

@wi/humaan.

6%@ M, a@ ms@ @fww R. HILSOHR.

CHEMICAL FEED DBVIGE.

APPLICATION FILED SEPT.11, 1912A Patented June 10, 1913.

2 SHEETS-SHEET 2.

@HOT/11C l' RALPH HILSCHER, F URBANA, ILLINOIS.

CHEMICAL-FEED DEVICE.

Specification of Letters Patent.

Patented June 10, 1913.

Application filed September 11, 1912. Serial No. 719,794.

To all whom z't 'may concern Be it known that I, RALPH I-Iinscirnn, acitizen of the United States, residing at Urbana, in the county ofChampaign and State ot' Illinois, have invented new and usefulImprovements in Chemical-Feed Devices, of which the following is aspecification.

My invention relates to a device for feeding a chemical solution into awater main, or the like, the primary object thereof being to providemeans for introducing the solution into the water passing therethroughat a. rate directly proportional to the rate of flow ,of the water inthe main. In accomplishing this object, a portion of the main isconstrieted in cross sectional area by introducing a'reduced section, orotherwise, and two water columns are established, one being connectedwith the full section of the pipe in advance of the reduced section,with respect'to the direction in. which the water is flowing, and theother water column being connected with the reduced section. The upperportions of these columns are connected with a receptacle. The watercolumn which is connected to the reduced section of the main is providedwith an adjustable valve, which may be regulated to afford apredetermined size of orifice for the passage of solution into the mainupon flow of water therethrough. Means is also provided within thereceptacle for the introduction of chemical solution into thesecondmamed water column, so as to artificially build up andvmaintain aneffective head on the oritice. said means being ldirectly controlled bythe effective head. By the term effective head is meant? substantiallythe vertical distance from the water level in the first column down tothe water level at which the water in t-he second column would standwere the inlet valve, or means for introducing t-he chemical solution,kept closed, this difference in level being caused by the pressurewithin the main as affected by the peculiar construction of the watermain at this point. Upon fluctuations of velocities of flow in the main,the relative heights of the water levels in the two columns are coi'-res'pondingly changed, the levels in the second column being lower thanthe levels in the first column when there is any flow through the main.The means provided for regulating the admission of chemical solutioninto the second column, by adjustment of the inlet valve, is constructedso as to be operated by such changes in the levels of liquids within thet-wo columns, or in other words, the said means operates in directproportion to the change in the effective head on the orifice, the sizeof which latter has been previously determined.

The invention consists of the features of construction, combination andarrangement of parts, hereinafter fully described and claimed, referencebeing had to the accompanying drawings, in which Figure l is afragmentary front elevation of the specially constructed water mainshowing the device attached. Fig. 2 is a longitudinal, verticalsectional View taken through the same, showing the difference in heightsof the liquids within the water columns when the pressure in the main isat its minimum, and the position of the admission valve as effected bythe same. Fig. 3 is a similar sectional view showing the position of thevalve when a balance between the ti'i'o columns has been established bythe intrruluction of a certain amount of chemical solution in the secondcolumn. Fig. 4. is a similar view showing the valve open wide undermaximum pressure conditions in the main, and before a balance has beenestablished. Fig. 5 is a similar view showing the position of the Valveafter a balance has been established, when the pressure in the main isat its maximum. Fig. 6 is a transverse sectional view taken on the lineG-G of Fig. l. i

In the drawings, l designates the water main which is reduced indiameter, as at 2. Adjacent to this portion of the main, I have provideda casing or chamber 3 having a. transverse partition wall 4 locatedbetween the ends walls 5 and 6 thereof, and which extends from thebottom wall 9 of the casing nearly to the top wall 10 thereof, leavingthe two compartments 7 and 8 open into each other at their upper ends.Under certain conditions of installation, hereinafter described, it willbe necessary to have this casing of air-tight construction, as just described, while, under other conditions, nirtightness will not benecessary. A pipe l1 connects the full section 12 of the main 1 with thelower end of the first compartment 7, open communication being thusestablished between the same. A second pipe 13 connects the reducedsection 2 of the main with the lower end of the second compartment 8 ofthe casing, and an adjustable valve 14 is provided in the said pipeconnection. A suitable reservoir 15 adapted to contain the chemicalsolution, and having means to supply the same under pressure, isprovided at a higher level than the casing 3, and is connected to thecompartment 8 adjacent the top wall 10 of the casing by means of aSuitable pipe 16 which enters the wall 6 through an opening 17 andprojects therein for a short distance, as at 18. The portion 18 of thepipe is provided with vertically alined openings 18EL and 18b which formseats for the upwardly tapering valve plugs 19 and 19, respectively, thelatter being secured to a vertically reciprocating valve stem 20 inspaced relation to each other and constituting as a whole the admissionvalve 191. The upper end of the valve stem 2O is attached to theextremity 21 of the lever 22, this lever being pivot-ally connected, asat 23, to the upper edge of the partition wall 4, its opposite end 24extending into the compartment 7 and being attached to the upper end ofa float 25 which extends nearly to the bottom of the compartment 7, soas to be supported by the liquid within this compartment. A second float26 is provided in the compartment 8.

and is attached to the opposite arm of the lever, as at 27, this floatbeing of similar construction and dimensions as the float 25. The valve19b is adapted to be opened upon downward motion of the stem 20 due to adifference occurring in the heights of liquids in the two compartments.

i In the operation of the device, the valve 14, which is handcontrolled, is adjusted to afford a predetermined size of orifice forthe passage of liquid therethrough. It will be seen, by reference toFigst 2 and 4, that, when the pressure within the main is a minimum,'the levels at which the liquids stand in the two columns are lower, asshown in Fig. 2, than the levels of the corresponding columns when thepressure is a maximum, as shown in Fig. 4. In either of these limitingcases, or in intermediate cases, when there is a How ofwaterfthrough themain, the level of water within the column 29, constituted by the pipe13 and the compartment 8 is lower than the level of the water in thecolumn 28, which latter is constituted by the pipe 11 and thecompartment 7, the float 26 being thus lower than the float 25 and thevalve 19b being correspondingly lowered, so as to permit a flow ofchemical solution through the same into the compartment 8. When thechemical solution flowing into the compartment 8 raises the level of thewater column 29, the float 26 will assume the same height as the float25, a balance between the two arms of the lever being thus establishedand the valve 19b being nearly closed so as to permit a reduced iow ofSolution, as shown 1n Fig. 3. Should the velocity in the main change,the height of liquid in the water column 29 will be proportionatelychanged with relation to the height of liquid inthe column 28, thisbeing due to the previously described reduction in the size of the watermain.

In Figs. 3 and 5 are shown the water columns under the two conditions ofminimum and maximum pressure in the main, respectively, when the balanceor' the floats has been established and an amount of chemical is flowinginto the compartment 8 through admission valve 191 equal tothe amountthat is flowing into the main through the orifice 14 under theprevailing effective head which effective head, as previously set forth,is that difference in levels of the two columns which ,would be obtainedif the admission valve 19b were held closed. Thus it will be seen that achange in the velocity of ow throu h the main causes a definite changein the e ective head on the orifice, the size of the latter beingdetermined by the adjustment of the valve 14, and the rate of flow ofchemical solution through the said orifice into the main is directlyproportionate to the prevailing velocity of the water within the main.rlhe said eliective head is thus built up and maintained by theintroduction of the chemical solution into the water column connected tothe reduced section of the main.

In case the static pressure in thev main should be subject to variationswhich would cause fluctuations in the water column 28 not greater-than acertain fraction of the length of the float 25, it would not benecessary for the casing to be air-tight, as shown, provided the casingwere placed at the proper elevation. In case the pressure in the mainshould be subject to wide variations, airg the former case, the top ofthe casing could be entirely removed.

What I claim is:

1. In a device of the class described, the combination with a water mainhaving a reduced section, of a casing disposed above the water main andincluding two compartments, means for establishing open communicat-ionbetween one of said compartments and the full section of the main inadvance of the reduced section, a valved connection between the reducedsection of the main and the other compartment, a source of fluid underpressure, a pipe connection between said source and the secondcompartment, a y valve in sa id pipe connection, a pivoted lever mountedwithin the said casing, and a float disposed within each compartment andconnected to the adjacent arm of the lever, said lever being operativelyassociated with the valve.

2. In a device of the class described, the combination with a Water mainhaving a reduced section, of a casing disposed above t-he water main andincluding.;` t\\'o compartments, means for establishing opencommunication between one of said compartments and the l'nll section et'the main in advance ot' the reduced section, a valve connection betweenthe reduced section of the main and the other compartment, a source ofHuid under pressure, a pipe connection between said source and the Qecond compartment, a balanced valve in said pipel connection, a leverpivoted within said casing and operatively associated with said valve,and a float disposed within each compartment and connected to theadjacent lever arm.

In testimony whereof I affix my signature in presence of two witnesses.

RALPH HILSCHER. lWitneissses lV. T. S'rRoNQUis'r, A. L. lVllu'rINe.

